无法在Angularjs Fusion Charts中显示数据

Question

如何将$ scope.ok.rate值添加到Angular Js中的myDataSource1对象？当数据是字符串时图表正常工作但是如果我设置值：$ scope.ok.rate，我得到错误：没有要显示的数据。

if (response.TotalPercent3) {
            $scope.ok = {
                "rate": response.TotalPercent3,
                "total": response.Total3
            };

console.log($scope.ok.rate); // Here I can see the output. It has a value.

    $scope.myDataSource1 = {
        chart: {caption: "Some week"},
        data: [
            {label: "Saturday", value: $scope.ok.rate},
            {label: "Sunday", value: "300"},